WPC-95 power driver board LEDs, test points and fuses
Ground is TP107. LED100/TP100 regulated +12 V, always on: fuses F101 and F106, diodes D11-D14, caps C11 and C12, regulator Q2 (LM7812). LED101/TP101 +5 V, always on (game won't boot without it): fuse F105, diodes D7-D10, cap C9, regulator Q1 (LM317). LED102/TP102 +18 V lamps, normally on (may flicker with lamps): F106, D11-D14, C11, C12. LED103/TP103 unregulated +12 V, always on: F109, D3-D6, C8. LED104/TP104 +20 V flashers, fades out with the coin door open: F107, D15-D18, C10. LED105/TP105 +50 V coils (50-70 V), fades out with the coin door open: F108, D19-D22, C22, then coil fuses F102, F103 and F104.
TP105 carries the 50 to 70 V coil supply.
Systems
Related tips
- WPC-95 driver board LEDs and test points
- WPC-95: all the 20 V coils dead, fuse good
- Supplies made on the WPC power driver board
- Shorted or open bridge rectifiers
- Flasher fuse F107 keeps blowing and a flasher transistor shorts: stray washer in a socket
- 12 V unregulated LED out on the driver board: open track to C8
- Driver board supply test points and normal readings
- Adding backup jumpers to a WPC-95 driver board
Source: Repairing Williams/Bally WPC Pinball Games from 1990 to 1999, Part Three, Clay Harrell (pinrepair.com)